Core molding machine



April 4, 3950 v J. FMAINE 2,502,467

CORE MOLDING MACHINE Filed Jan. 4, 1946 5 Sheets-Sheet 1 a /z 9 4 L? 3 5/4 I I U. I i l/ INVENTOR.

(J2me: 76 H@ April 4,- 1950 J. F. MAINE CORE, MOLDING MACHINE.

I 5 Sheets-Sheet 2 Filed Jan. 4, 1946 INVENTOR. Mar n65 F/fiw/ns 4& QM

5 Sheets-Sheet 3 N L\\\\\\\\\\\\\ I MEI J. F. MAINE CORE MOLDING MACHINEa :5 WM

Filed Jan. 4, 1946 April 4, 1950 INVENT OR. L/a/mes F/Va/he y KW Cw abHTTORA/E) J- F. MAINE April 4, 19 50 CORE MOLDING MACHINE 5 Sheets-Sheet4 Filed Jan. 4, 1946 III - INVENTOR.

James F/ fa/kle fiW FlTTOKA/E Y J. F. MAINE April 4, 195,0

CORE MOLDING MACHINE 5 Sheets-Sheet 5 Filed Jan. 4, 1946 Emmy PatentedApr. 4, 1950 UNITED STATES PATENT I OFFICE j CORE MOLDING MACHINE JamesF. Maine, Cleveland, Ohio, assignor to The Consolidated Iron-Steel Mfg.00., Cleveland, Ohio, a corporation of .0hio 7 Application January 4,1946,8erial No. 639,077"

ther booking movement, the complete but fragile core thus formed istransferred to a drier device or-support which fits the core by which itmay be supported without damage and on which it may be carried to adrying or backing oven, where it is rendered rigid and durable and readyfor use in afoundry molding flask.

One such core molding machine constitutes the subject matter of PatentNo. 2,196,835, April 9, 1940; and the present invention may beconsidered as comprising improvements overthe machine of that patent;and reference to said patent will afford a better background for considveration of the present invention.

As shown in that patent, for example, and as contemplated in the presentinvention, a core molding machine of this class comprises. at leastthree hingingly supported frame elements, disposed in a line;' two ofthem for supporting molds for the core parts, and which for conveniencemay be designated as the left hand and middle movement of the elementsabout the said axes,

2 with the core in its cavity is then removed to the oven.

The left hand and right hand frame elements thus each rock about an axisof rotation, and the middle frame element rocks alternately around bothof these axes. A particular construction of bearings is. thus requiredto provide. this rotational or rocking.

and it is one of the objects of this invention to provide improvedbearing constructions and bearing supports for these purposes.

The said frame elements must be made of metal to be strong, durableandaccurately position-.

able, and must be of ample size to accommodate large cores, andtherefore are unavoidably of.

such size and weight, including the weight of the molds and drierdevice, so that the rocking of the frame elements is fatiguing to theoperator, particularly when operated by women- It is a known expedientto counterbalance the I weight of a rocking element of a machine of thisframe elements, and the other or right: hand; frame element supportingthe drier device or;

support for the whole core.

The molds, and Q, drier device have open cavities for their desaidcavities upwardly open.

In operating such a machine, as described in said patent, after the coremold cavities are filled with core material, the left hand andmiddlevelements are hingingly rocked by hand around a common axis, oneclockwise and the other counterclockwise, to vertical positions, tobring the two core parts therein together; and then both are rockedclockwise to horizontal positions and todeposit the complete core in themold cavity of the middle frame element, and the other or left handframe element is rocked back again, counterclockwise to its originalposition. The middle frame element now carries the complete core in itsmold cavity. The core drier device is then placed on the core. The righthand frame element is then rocked by hand around a second common axis,to hold the drier device upon the core, and then both the middle frameelement and right hand frame element are rocked together clockwise todeposit the drier device, and the contained core, on the now horizontalright hand frame element, and the middle frame element is then rockedcounterclockwise back to its original horizontal position. The drierdevice general class, as evidenced by the utilization of acounterbalancing spring in the aforesaid patent, for one of thepartsthereof not involved in the said booking movements of the core makingframes. But so far as I am aware it has heretofore been consideredimpossible to counterbal ance the said rocking frame elements of a coremolding machine, having the complex booking movements described above,and particularly'the middle frame element, .because of the fact that itvrocks about two axes alternately.

It is .therefore another object of the invention to provide a coremolding machine of the type referred to in which all of the booking orrocking elements are weight-counterbalanced.

Another object is to provide a core molding machine of the typedescribed above providedv with weight counterbalancing means for thebooking frame element thereof which rocks,

around either of, ,two said axes alternately. Another object istoprovide improved latching means coordinated with the aforesaidcounterbalancing means of the said hingingly supported Fig. 6 is a topplan view of an apparatus em-- bodying the invention, with parts brokenaway for simplification, and parts in section;

Fig. 7 is a sectional. view from the plane 1 of Fig. 6, with partsbehind the section plane omitted to simplify the drawing;

Fig. 8 is a sectional view from the plane 8 of Fig. 6 or Fig. "1;

Fig. 9 is a view to enlarged scale of a latch mechanism of Fig. 7;

Fig. 10 is a view in the direction of the arrow ll) of Fig. 9;

Fig. 11 is a view from the plane I! 'of 'Fig. "6;

Fig. 12 is a sectional view :fromthe :plane 12 or Fig. 6;

Fig. 13 is a view to enlarged scale of a latch mechanism the view beingtaken from the .plane l3 of Fig. 6;

Fig. 14 is a sectional view to enlarged scale from the plane it of Fig.13

:Figs. 15 and 16 are'sectional views to enlarged scale of parts shown inplan in Fig. 6;

Fig. 17 is a sectional view from the plane H of Fig. 15;

Fig. 18 is a sectional view from the plane 18 of Fig. 16.

In Figs. 1 to .5 inclusive is illustrated diagrammatically the abovedescribedbooking movements of a machine of the class referred to.

A main frame i has upright posts 2 and 3 thereon providing supportsforbearings, the axes of which are indicated at 4 and 5, respectively.

A left hand end frame 6, a middle frame I, and a-right'hand end frame 8normally rest-on the frame I, and may be rocked by hand with hinging orbooking movements on the said axes 4 and 5.

At '9 and H] are two halves of a core mold mounted on the frames 6 and 1respectively, and at H is a carrier or drier device for the finishedcore on-the frame 8.

In operation the two halves of the core mold, 9 and ID, are secured totheir'frames 6 and 1, and have their mold cavities f2 and I3 filled withcore making material struck off on a parting line or plane, and then theframes Band 1 are both rocked by hand toward each other around the axis'4 into the position of Fig. 2 superimposing the two core molds 9 and Iupon each other on the-parting plane, and forming the complete coretherebetween.

The'two frames 6 and l are then rocked clockwise to the position of Fig.3 wherein the frame 6 and core mold 9 are shown in broken line andthe-frame '1 and core mold in solid line; and theframe'B and core mold 9are then rocked back to their original position shown in solid line,removing the core mold-9 from'the core I 5 leaving it in the core mold[0.

The core carrier II is then picked up and laid on the core mold ID asshown'in Fig. 4, andthe frame 8 is rocked counterclockwise around itsaxis 5 to the position of Fig. 4.

Both frames 1 and Bare then rocked clockwise around the axis 5 to theposition of Fig. 5 wherein the frame 7 and the core mold in areshown inbroken line, and then the frame 1 and the core mold 10 are rockedcounterclockwise around the axis-5 to the position shown in solid linein Fig. 5 leaving thefinished core Won the carrier or drier device II.

The carrier H with'the finished core thereinis then removed tothe-baking oven.

in view of the state of =this art including the aforesaid patent, it isbelieved that it will be understood how the halves of-the core mold, 9and H1, and the drierdevice or support H are constructed, and how themolds are positioned on their respective frames 6 and I and securedthereto, by bolts or the like, and that further description -thereofherein 'is unnecessary; and

inasmuch as the present invention relates to the construction andoperation 'of "the frames, particularly the middle frame landits-bearings on the axes 4 and 5, and the means for counterbalancing theweight of the frames, particularly the weight of the middle frame I inboth directions of oscil- "la'tion on these axes, the followingdescription will be confined largely to those features to avoidcomplications, and this will not be given in connection with Figs. 6 to18 inclusive.

The main frame I comprises a vertically edgewise strip of metal bentinto rectangular form, seeFigs. 6, '7, and 11, and supported at itscorners by tubular legs Il-l'l, and has the aforesaid bearing posts 2and 30h the front side thereof and corresponding opposite bearing posts2A and 3A at the rear side; the posts 2 and 2A providing supports forfront and rear bearing constructions respectively having in general abearing axis :4 and the front and rear posts 3 and 3A likewise providingsupports for front and rear bearing constructions having in general thebearing axis 5, these axes being indicated in Figs. 7 and ll.

The middleframe l is, in the actual structure, in two framepar-ts JA and1B.

The part 1A comprises forwardly and rear- Wardly spaced side rails18-48, at the left end of which are hanger arms 19-! extending upwardlytherefrom toward the-bearing axis! and'a't the right end of which aresimilar hanger "arms 20-20 extending upwardly to the bearing axis 5. Theside rails Iii- 18 are connected together and br aced near their lefthand ends' by a transverse bar 2| and near their right hand ends byatra'nsverse tubular brace 22, which braces may be'w'elded at theiropposite ends to the side rails.

The upper sides of the side rails l-8'I 8 provide a surface 23 uponwhich'the core mold'l 0 of -Fig. 1 may be mounted, and by means of fourbolt-holes 2424 the core mold'may be fastened thereon'by bolts notshown.

Each of the hanger arms 20-20 is provided with a ballbearingconstruction 3| for oscillation about the axis 5, one of'the bearingconstructions being shown to small scale in section on -the front of thedevice'in Fig. 6 andth'e one on the rear of the device bein'g shown tolarger scale in section in Fig. '15.

An -upwardly open socket 25 has a shank -26 thereon, and a. reduceddiameter threaded portion thereof extending through'thepost 3Aand'rigi'dl-y mounted thereon by a nut '28as shown 'in'Fig. 1 5; and asimilar socket 29 ismounted on the'pos't3.

The right hand end frame -'8 (Fig. 1) shown fragmenta'rily at'8-8,-Fi'gs. 6 and 15, is provided with-ball bearing constructions .30inhanger arrns 8A mounted on the shanks ZS-26 of the "two sockets 2'5and 29 for oscillatingo'n the -a'xis'fi; and with a depending 'fing-er32, Fig. :6, on the frame 8; and with'a spring33 hooked atjone end intothe lower end of the "finger 32 and at the other end hooked into anadjustable stud -3'4"on the main frame I; thereby'providing means forcounter-balancing the weight of the frame- 8.

A round rod 35 (which as will appear later functions as a handle bar hason its opposite ends, trunnions 363ii normally resting in-and bottomingin the sockets 25-and 29, an drigidly mounted on the ends of the rod 35;and to and the bar 55.

and a clamping nut 40 is provided on the threads 31; whereby a rigidassembly is made constituting the rod 35, trunnion nut 36, hanger arm38, and bearing core 39; and whereby the rod 35 is normally supported bythe trunnion nuts 36 in the sockets 25 and 29. Ball bearingconstructions shown generally at 3l-3l are assembled on and with thebearing cores 39 and upon these ball broken line of the hanger arm I9and frame IA.

At the left hand side of the device are upwardly open sockets 42 and. 43mounted respectively on the posts 2A and 2 by shanks 44 thereon havingthreaded portions 45 extending through bores in the posts and nuts 46 onthe threads.

The hanger arms I9, rising from the left end of the frame IA and fromthe side rails I8I8 thereof, have mounted thereon roller bearingtrunnions 4I, normally in and bottomed in the sockets 42 and 43. To thisend, the roller bearing trunnion comprises an outer tubular cylindricalshell 48, the inside of which constitutes a raceway for rollers 49, andhas an inner raceway 50 for the rollers provided with a threaded studextending through the hanger arm l9 and-threaded into the end of a rod52, whereby the hanger arm I9 is clamped between the raceway 50 and theend of the rod 52, to mount both the roller bearing trunnions 41 and therod 52 upon the hanger arms I9-I9; the rod 52 functioning in the op- 1eration of the device as a handle bar to be The other of the two partsof the middle frame,

namely the part IB, comprises spaced apart side rails 53-53 connectedtogether and braced by a tubular brace 54 at the right hand side, and bya. flat bar 55 at the left hand side, and by a diagonal brace 56 weldedat opposite ends to the brace 54 Hanger arms 5I extend upwardly from theleft end of the side rails 53, and the aforesaid hanger arms 38 extendupwardly from the right hand end thereof. The side rails 53-53 of theframe part IB as shown in Fig. 7 are ata lower level than the side railsI8'-I 8 of the frame part IA. The hanger arms 38 as described above arerigidly clamped upon the transverse handle bar 35 and likewise have thenut trunnions 36 thereon as described. The hanger arms 51 at the leftend of the frame part IB are provided with ball bearing constructions 58mounted upon the shanks 44 which support the sockets 42 and 43.

The left hand end frame 6 referred to in connection with Figs. 1 to 5and fragmentarily shown at 6-6-6 in Figs. 6, '7, and 11, is also mountedon the said socket shanks 44 by ball bearing constructions 59-59, inhanger arms 6A of frame 6, and has a finger 60 depending therefrom, anda spring 6! hooked at one end into the lower end of the finger and atits other end hooked into an adjusting stud 62 on the main frame I bywhich the frame 6 is counterbalanced.

From this much of the description as to the frame part IE it is believedto be evident that upon grasping the rod 35 as a handle bar and liftingon it, both frames IA and IE will be rocked counterclockwise around theaxis 4, the rod 35 lifting the bearing constructions 3l-3I, and liftingthe nut trunnions 36 out of the sockets 25 and 29, the frame IB rotatingon the axis 4 on the ball bearing construction 58--58, and the frame IAat the same time rotating on the roller bearing trunnions 4I-4'I Fig. 11showing in solid line the frame IB in its normalposition and in dottedline in its full counterclockwise rocked position. i

It is here emphasized that both frame parts IA and IB rock togetherclockwise or counterclockwise around the axis 4; and that the frame partIA alone rocks clockwise or counterclockwise around the axis 5, leavingthe frame part IB in its normal unrocked position.

The counterbalancing springs for the frame parts IA and IE will now bedescribed.

For the frame part IA, Figs. 6 and 7, the bracing bar or tube 22 has anarm 63 welded thereto under the'axis 5 extending toward the right at anupward inclination. Pivoted to its end as at 64 is a depending link 65,free to rotate counterclockwise on the pivot 64 but prevented normallyfrom rocking clockwise by the engagement of a shoulder on the link withthe arm 63. A spring 61 is hooked at one end to the lower end of thelink 65 and at its other end is hooked into an adjustment stud 68extending through an eye 69 welded upon the brace bar 55, and with locknuts on each side of the eye as shown to adjust the tension of thespring 61.

For the frame IB, one of the hanger arms 51 has a finger I0 thereonpivoted at its lower end as at II and below the axis 4 to a link I2, anda spring I3 is hooked at one end into the link I2 and at its other endis hooked to a threaded adjusting stud I4 extending through a post I5 onthe main frame and with lock nuts on each sideof the post as shown toadjust the tension of the spring I3.

parts in their normal positions illustrated, exertresilient torquetending to rotate the frame IA clockwise and the frames IA-IBcounterclockwise'around the axes 4 and 5 respectively; and inasmuch asin the operation of the device as described it is required that the saidframe parts normally remain in their unrocked positions illustrated, andthat the two frame parts IA and IB are to be rocked together at onetime, and the frame part IA is to be rocked alone at another time, meansis provided to hold the frames against being rocked by theircounterbalancing springs except when rocking is wanted, and operable bythe operator of the device at the time of rocking the frames; and thismeans, comprising latches,"

science handle M. A spring 8 I resiliently 'urgesfth'e r-latch:

IQ-in the clockwise direction around the pivot pin 18 as viewed in Figs.'7 and 9, and toward a shoulder -82 on the post Tl, whereby the:movement of the latch may be limited and the spring 8i always loaded. Alatch .pin 83 is provided on the-hanger arm l9. v

The latch 79 normallyhooks over the pin 83 andholds the frame parts .l'Adown in .its normal position. To release the frame M so that it :can berocked around the axis 5, the operator, whenlhe grasps the handle bar52, may-engage thelatch handle .imwith his thumb or finger and rock thelatch out of engagement with thelatch pin .83. When the frame ITA isreturned counterclockwise to its normal position, the. latch pin 83 (seeFig. 7 where it is shown in a partlyrocked position of the frame part1A) descends and engages ;thelatch F8 in its said limited position andcammingly rocks it counterclockwise around the pivot 18, and finally thelatch 19 snaps clockwise overithe pin -83.to latch the frame part 1A inits normal position.

lolatchthe two frames lA-'B from rocking counterclockwise around theaxis a latch shown generally at 84 is provided. A channeleshaped post 85issecur'ed at its lower end to a-transverse'braoe element 86 of themainframe, Figs. 11 and 13, and extends upwardly therefrom, and has apivotpin 81, thereon. A latch 88 is mounted on the -,-pin and between theside flangesof; the channel B5, and, above the pivot pin it hasa handle-89. The latch 88 is constrained resiliently in the'clockwise directionby a spring 90. The

lower end of the latch element 83 abuts uponthe transverse brace pipe 54on the frame part.

1A. The latch handle 8! is convenient to. the

hand of the operator grasping the handle bar,

35, and upon rocking the latch 88 counterclockwise'as viewed in Fig. 13against the tension of the spring 90, the latch '88 is freed from thebrace 54 and the frames EA-7B are freed to rock about the axis 4. Whenthese frames are returned to their normal position, the bar 54rides'over the lower end of the latch .88 and then the latter snapsbackinto the position ofFig. 13 and latches theseframesdown again in theirnormal position.

Referring again to Fig. 3, when the frame 6 and the core mold 9 wererotated back around the 4 from the broken line to the solidlizieposition, it is presupposed that the core is of such shape that the coremold 9 will draw away therefrom without mutilating the core, although"the core mold '9 moveson-a circular are around theaxis 4. In somecaseshowever the core 425 may. be of suchshapeor of such great verticaldimension that to thus strip the core mold 9 from iton a circular arcwould mutilate-it, In such cases, I have providedmeansin which when thetwo core molds 8 and it are superimposed on each other as in 3, the coremold l-i! vmay be withdrawn downwardly from the-core mold 9 todraw thecore out of the core mold 9 vertically before the core mold fl isrotated ,counterclocka wise around the axis 4. V 7

It will be observed that the illustrated and-described disposition ofthe said "counterbalancing springs 55? and E3 and of their connectionswiththeir respective frames EA and 1B, causes them to have the folowingcounterbalancing characteristics. When'the frames are in their-normalpositions and are ready to be rocked,xby the operator grasping thehandlebars, the weight to be lifted is maximum lying as it doesentirely:

end to the stationary main frame.

frarnepart 1B isunlatched from the main frame,-

at on-e side oftheaxis t or 5, and inthis position.

thezcounterbalancing torque exerted by the spring ineaoh case tending to:aid the rocking movement is the maximum. .Asthe frames are rocked andthe center of.;gravity of the frames becomes more and more nearlyvertically above the axes i :and .5, the counterbalancing torques of theshringspacting in the direction .to help lift the frames, dies out. Whenthe frames are rotated beyond the vertical position, the torquesexertedby t'he springs begin to build up in the opposite.

direction and again become maximum :when the frameshavebeen rocked toapproximately 189 de-: grees from the normal position. In other words,.'

the frame 11A rocks through approximately degreessaround the axis 5 andthe frames 'lA;lB rockap'proximately 180 degrees around the axis A. Atthe beginning. and ending of this angular movement, 'the effectiveweight of the frame in..e.achcase'is great and diminishes towardthemiddle. of 'themovement. The counterbalancing springs counterbalance theweight approximately equally throughout the 180 degrees by exertinggreat the two frame parts are left latched together and both can then begiven a hinging movement in unison on the axis 4, at their left ends,upwardly and over this axis in alternate directions. 'Whcn theframepartTB is latched to the main frame,

the frame part IA can be unlatohed from it, the

part l'B remaining latched to the main frame, and the partE'lA can thenbe given a hinging movement by .itselfon the axis 5, at its right end,upwardly-and over that axis inalternate directions.

fAsto the counterbalancing springs, the spring; filrconnected at itsrightend to the frame part IA to counterbalance its movement around theaxis 5,.is connected at its left end to the frame part 1B and istherefore stationary at that end when the frame part 7A is moving byitself. The spring 13 connected at itsleftend to the frame part IE tocounterbalance both'frame parts .IB

.: andxl-A'when moving around the axis 4, is 0011-.-

nected at its right end .to the stationary main frame I When the partslA'iB rockaroundthe axrs a, in unison, the spring :67 moves bodily inuni-son with them. Thus each spring acts independentlyof the'other toexert counterbalancing' torque, and neither affects or modifies theaction ofthe other, whereby each can'be independently adjusted for theoptimum amount of counterbalancing torque, for any given Weight ofeither of the rocking parts, 7A or 1A1B..

An illustrative embodiment of the invention has been set forth above,but the inventionis not a limited :in all respects to this particularembodiment. Changesand modifications in various parts of the describedstructure may be made, such as.

willoccur to'those skilled in the art; andthe invention'is comprehensiveof all such changes and.

modifications whichcome within the scope of the appendedclaims. 1

When the I claim:

1. In a core molding machine, a main frame,

two bearing constructions on the main frame providing two bearing axesspaced apart; a core mold-supporting frame in two frame parts; thebearing constructions comprising means hingingly supporting one framepart for hinging movement by itself on and upwardly over one bearingaxis in alternate directions; and comprising means hingingly supportingboth frame parts for hinging movement together in unison on and upwardly over the other bearing axis in alternate directions; the said oneframe part constructed to have a core mold attached thereto; a pair oflatch means to latch the respective frame parts each in a normalposition to prevent said hinging movements thereof and selectivelyreleasable by an operator to permit hinging movement of the one framepart by itself and hinging movement of 'both frame parts in unison; andrespective weight counterbalancing means arranged to counterbalance theweight'of the one frame part during hinging movement thereof by itselfand to counterbalance the weight of both frame parts during hingingmovement thereof in unison.

2. In a core molding machine, a main frame, two bearing constructions onthe main frame providing two bearing axes spaced apart; acoremold-supporting frame in two frame parts; the bearing constructionscomprising means hingingly supporting one frame part for hingingmovement by itself and independently of movement of the other part onand upwardly over one bearing axis in alternate directions, andcomprising means hingingly supporting both frame parts for hingingmovement together in unison n and upwardly over the other bearing axisin alternate directions; said one frame part having a trunnion thereonnormally removably engageable in an upwardly open socket receptacle atthe said other bearing axis; and the other of the frame parts having atrunnion thereon normally removably engageable in an upwardly opensocket receptacle at the said one bearing axis.

3. In a core molding machine, a main frame; two bearing constructions onthe main frame providing two bearing axes spaced apart; acoremold-supporting frame in two frame parts; the bearing constructionscomprising means hingingly supporting one frame part having hingingmovement by itself on and upwardly over one bearing axis in alternatedirections, and said part having a trunnion thereon normally removablyengaging in an upwardly open socket receptacle at the other axis; andcomprising means hingingly supporting both frame parts for 'hingingmovement together in unison on and upwardly over the other bearing axis'in alternate directions; and the other of the frame parts having atrunnion thereon normally removably engaging in an upwardly open socketreceptacle at the said one bearing axis; a pair of latch means to latchthe frame respective parts in normal positions with their respectivetrunnions in the respective sockets to prevent hinging movement thereof,and releasable selectively by an'operator to permit hinging movement ofthe one frame part by itself and hinging movement of both frame parts inunison, selectively.

4. In a core molding machine, a main frame, two bearing constructions onthe main frame providing two bearing axes spaced apart; acoremold-supporting frame in two frame parts; the bearing constructionsomprising means hingingly supporting one frame part for hinging movementby itself on and upwardly over one bearing axis in alternate directions;and comprising means hingingly supporting both frame parts for hingingmovement together in unison on and upwardly over the other bearing axisin alternate directions; the said one frame part constructed to have acore mold attached thereto; a latch to normally latch the other of theframe parts to the main frame and a latch to normally latch the oneframe part to the other frame part, to normally prevent hingingmovements, and the latches being releasable by an operator selectively.

5 In a core molding machine, a main frame, .two bearing constructions onthe main frame providing two bearing axes spaced apart; acoremold-supporting frame in two frame parts; the bearing constructionscomprising means hingingly supporting one frame part for hingingmovement by itself on and upwardly over one bearing axis in alternatedirections; and comprising means supporting both frame parts for hingingmovement together in unison on and upwardly over the other bearing axisin alternate directions; the said one frame part constructed to have acore mold attached thereto; weight counterbalancing means for the twoframe parts when hingingly moving in unison comprising a springconnected between the other of the frame parts and the main frame; andweight counterbalancing for the one frame part when hingingly moving byitself comprising a spring connected between the two frame parts.

6. In a core molding machine, a. main frame, two bearing constructionson the main frame providing two bearing axes spaced apart; acoremold-supporting frame in two frame parts; one frame part provided)with means for attaching a core mold thereto and having hingingmovement by itself on and upwardly over one bearing axis in alternatedirections, and normally supported by a trunnion thereon removablyengaging in an upwardly open socket receptacle at the other axis; andboth frame parts having hinging movement together in unison on andupwardly over the other bearing axis in alternate directions; and theother of the frame parts normally supported by a trunnion thereonremovably engaging in an upwardly open socket receptacle at the said onebearing axis; latch means to normally latch the other of the frame partsto the main frame and latch means to normally latch the one frame partto the other frame part, to normally prevent hinging movements, andmeans operable by an operator to release the latch means selectively;weight counterbalancing means for the two frame parts when hinginglymoving in unison comprising a spring connected between the other of theframe parts and the main frame; and weight counterbalancing means forthe one frame part when hingingly moving by itself comprising a springconnected between the two frame parts.

JAMES F. MAINE.

REFERENCES orrnn The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 13,097 Molder Mar. 22, 1910942,419 Strettles Dec. 7, 1909 1,017,039 Delanoy Feb. 13, 1912 1,780,470Dunham Nov. 4, 1930 2,163,964 Prehoda June 27, 1939 2,196,835 Maine Apr.9, 1940

